CN111755550A - Circuit arrangement mode of solar photovoltaic module - Google Patents

Circuit arrangement mode of solar photovoltaic module Download PDF

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Publication number
CN111755550A
CN111755550A CN202010598216.8A CN202010598216A CN111755550A CN 111755550 A CN111755550 A CN 111755550A CN 202010598216 A CN202010598216 A CN 202010598216A CN 111755550 A CN111755550 A CN 111755550A
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China
Prior art keywords
battery
parallel
series
string
strings
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CN202010598216.8A
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Chinese (zh)
Inventor
黄宏伟
张舒
郭俊盼
王乐
冯志强
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Trina Solar Co Ltd
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Trina Solar Co Ltd
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Priority to CN202010598216.8A priority Critical patent/CN111755550A/en
Publication of CN111755550A publication Critical patent/CN111755550A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
    • H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H02S40/34—Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

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  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The invention discloses a circuit arrangement mode of a solar photovoltaic module, which is characterized in that: the solar cell comprises a plurality of solar cells, wherein the solar cells are connected in series to form a cell string, and the cell string is arranged according to any one of the following modes: mode 1: 2 battery strings are connected in parallel to form 1 battery string series, 1 or more battery string series are connected in series to form a battery unit, and a plurality of battery units are connected in series to form a photovoltaic module; mode 2: 4-6 battery strings are connected in series to form a battery string series, 1 battery unit is formed by connecting the battery string series in parallel, and a plurality of battery units are connected in series to form a photovoltaic module; the number of the battery pieces in the battery string is more than or equal to 2, the areas of the battery pieces are equal, and the battery pieces are connected through welding strips or conductive adhesive; and a bypass diode is connected between two adjacent battery units or in parallel in each battery unit. The invention can reduce the voltage at two ends of the bypass diode and reduce the risk of hot spots.

Description

Circuit arrangement mode of solar photovoltaic module
Technical Field
The invention belongs to the technical field of solar energy, and particularly relates to a circuit arrangement mode of a solar photovoltaic module.
Background
At present, a photovoltaic module is continuously developed towards a high power direction, the size of a battery piece is larger and larger, and a large battery piece is cut into small battery pieces by using a mode of cutting by 1 to 2 or even 1 more, and then a circuit is designed in a mode of series connection or series and parallel connection combination so as to achieve the optimization of module output power and module size. However, as the size of the battery piece is larger and larger, the number of the cut pieces is larger and larger, the battery size is overlarge due to the fact that more and more battery pieces are connected in series in each conventional string, and the risk of hot spots exists due to the fact that the voltage at two ends of the bypass diode is too large.
Disclosure of Invention
The invention aims to: the novel circuit arrangement mode is provided, the size of the component can be optimized to a certain extent, the voltage at two ends of the bypass diode is reduced, and the risk of hot spots is reduced.
Therefore, the invention adopts the following technical scheme:
the utility model provides a solar PV modules's circuit arrangement mode which characterized in that: the solar cell comprises a plurality of solar cells, wherein the solar cells are connected in series to form a cell string, and the cell string is arranged according to any one of the following modes:
mode 1: 2 battery strings are connected in parallel to form 1 battery string series, 1 or more battery string series are connected in series to form a battery unit, and a plurality of battery units are connected in series to form a photovoltaic module;
mode 2: 4-6 battery strings are connected in series to form a battery string series, 1 battery unit is formed by connecting the battery string series in parallel, and a plurality of battery units are connected in series to form a photovoltaic module;
the number of the battery pieces in the battery string is more than or equal to 2, the areas of the battery pieces are equal, and the battery pieces are connected through welding strips or conductive adhesive; and a bypass diode is connected between two adjacent battery units or in parallel in each battery unit.
The circuit arrangement is as follows: every two battery strings are connected in series to form a battery unit, and the battery units are connected in series, wherein if the number of the total parallel battery strings is 2m (m is an even number), the positive and negative lead-out wires of the assembly can be on the same side, if the number of the total parallel battery strings is 2m (m is an odd number), the positive and negative lead-out wires of the assembly are not on the same side, and if the same side needs to be provided with a bus bar for the transverse string design. The invention can be connected with a bypass diode in parallel in each battery unit or between two battery units according to actual requirements. The detailed description is as follows:
scheme 1 is a scheme in which the number of parallel battery strings is 2m strings (m is an even number): taking 12 strings as an example, the number of each string of battery pieces is more than or equal to 2, the battery pieces are connected in series into battery strings through welding strips or conductive adhesive, each two battery strings are connected in parallel to form a battery unit, 6 battery units are connected in series, a bypass diode is connected in parallel between every two battery units, and correspondingly, the assembly is provided with 3 junction boxes.
Scheme 2 is another scheme when the number of parallel battery strings is 2m strings (m is an even number): taking 12 strings as an example, the number of each string of battery pieces is more than or equal to 2, the battery pieces are connected in series into battery strings through welding strips or conductive adhesive, each two strings of battery strings are connected in parallel to form a battery unit, 6 battery units are connected in series, each battery unit is connected in parallel with a bypass diode, the total number of the bypass diodes is 6, and after the design of the junction box is optimized, the assembly is provided with 4 junction boxes.
Scheme 3 is another scheme when the number of parallel battery strings is 2m strings (m is an even number): taking 24 strings as an example, in the foregoing scheme 1 and scheme 2, the terminal box is at the edge of the assembly, in each string of battery strings in the scheme, the number of battery pieces is even, the terminal box can be arranged in the middle of the assembly, wherein each two strings of battery strings are connected in parallel to form a battery unit, two battery units are connected in series to form a series string, each two series strings are connected in parallel to form a large parallel unit, 3 large parallel units are connected in series, and 3 terminal boxes are arranged corresponding to the assembly.
Case 4 is a case where the number of parallel battery strings is 2m strings (m is an odd number): taking 14 strings as an example, the number of each string of battery pieces is more than or equal to 2, the battery pieces are connected in series into battery strings through welding strips or conductive adhesive, every two battery strings are connected in parallel to form a battery unit, 7 battery units are connected in series, a bypass diode is connected in parallel between every two battery units, 3 bypass diodes are connected in parallel in total, the remaining battery units are connected in parallel with a bypass diode independently, 4 bypass diodes are connected in total, and the corresponding assemblies are provided with 4 junction boxes.
Scheme 5 is another scheme when the number of parallel battery strings is 2m strings (m is an odd number): taking 14 strings as an example, the number of each string of battery pieces is more than or equal to 2, the battery pieces are connected in series into battery strings through welding strips or conductive adhesive, each two strings of battery strings are connected in parallel to form a battery unit, 7 battery units are connected in series, each battery unit is connected in parallel with a bypass diode, the total number of the bypass diodes is 7, and the assembly is provided with 4 junction boxes after the design of the junction boxes is optimized.
Scheme 6 is a scheme in which the number of battery cells is 2m strings (m is an odd number): taking 28 strings as an example, the junction boxes of the schemes 4 and 5 are arranged at the edge of the assembly, the number of each string of battery plates is even, the junction boxes can be arranged in the middle of the assembly, after every two strings are connected in parallel to form a parallel unit, two parallel units are connected in series to form a series string, every two series strings are connected in parallel to form a large parallel unit, so that 3 large parallel units and 1 small parallel unit are formed, and 4 junction boxes are arranged corresponding to the assembly.
Above scheme all is horizontal version type, and along with the silicon chip size is bigger and bigger, the subassembly width receives under the transportation restriction can not too wide condition, and the design through this version will cut back battery piece minor face as the width direction of subassembly, can be as many as possible cluster battery piece and can not influence the width of subassembly, and the scheme through parallelly connected establishing ties again cooperates bypass diode's use can reduce the hot spot risk simultaneously. In addition, the junction box can be selectively arranged in the middle or on two sides of the assembly through different specific embodiments.
Compared with the prior art, the invention provides a novel circuit arrangement mode through the design scheme, the size of the component can be optimized to a certain extent, the voltage at two ends of the bypass diode is reduced, and the risk of hot spots is reduced.
Drawings
Fig. 1a is a circuit diagram of a solar module according to embodiment 1 of the present invention;
FIG. 1b is a schematic backside view of a solar module according to embodiment 1 of the present invention;
fig. 2a is a circuit diagram of a solar module according to embodiment 2 of the present invention;
FIG. 2b is a schematic backside view of a solar module according to embodiment 2 of the present invention;
fig. 3a is a circuit diagram of a solar module according to embodiment 3 of the present invention;
FIG. 3b is a schematic backside view of a solar module according to embodiment 3 of the present invention;
FIG. 4a is a circuit diagram of a solar module according to embodiment 4 of the present invention;
FIG. 4b is a schematic backside view of a solar module according to embodiment 4 of the present invention;
wherein: 1 is a single battery piece; 2,3,4 and 5 are battery strings formed by connecting single battery plates in series; 6 is a bypass diode; 7 is the positive output of the component; 8 is the negative output of the assembly; 9,10,11 and 12 are junction boxes.
Detailed Description
Example 1:
as shown in fig. 1a and fig. 1b, the present embodiment is one of the schemes in which the number of parallel battery strings is 2m (m is an even number). Taking 12 strings as an example, wherein 11 single battery pieces are connected in series to form a battery string, 2 and 3 in the figures are the battery strings, and 2 and 3 are connected in parallel to form a battery unit; by analogy, 4 and 5 are also the battery strings, and 4 and 5 are also connected in parallel to form a battery unit. The battery units of the battery strings 2 and 3 which are connected in parallel are connected in series with the battery units of the battery strings 4 and 5 which are connected in parallel, and a bypass diode 6 is connected between the two battery units in parallel. In this embodiment, the battery strings have a total of 12 strings, and so on, to form 6 battery units, and connect and set the bypass diodes in the above manner. As shown, 7 is the assembly positive output and 8 is the assembly negative output. Correspondingly, the assembly has 3 junction boxes, which are respectively marked as 9,10 and 11, wherein 9 and 11 are output positive and negative poles, and 10 is one bypass diode. When 1 of the bypass diodes is started, the rest 8 strings of batteries can also normally generate electricity.
Example 2:
as shown in fig. 2a and fig. 2b, the present embodiment is another scheme in which the number of parallel battery strings is 2m (m is an even number). The main differences from example 1 are: each cell is connected in parallel with a bypass diode 6, as shown in fig. 2a, 6 bypass diodes are connected in parallel with each cell, and in correspondence with this, the assembly is provided with four terminal blocks, respectively referenced 9,10,11, 12, wherein: the junction box 9 is provided with a component anode and a bypass diode; a bypass diode is arranged in the junction box 10, and two bypass diodes and a component cathode are arranged in the junction box 11; in junction box 12 are two bypass diodes. In this embodiment, when 1 of the bypass diodes is started, the remaining 10 strings can still normally generate power, and the output power is increased 1/6 on the basis of embodiment 1.
Example 3:
as shown in fig. 3a and fig. 3b, this embodiment is a scheme in which the number of parallel battery strings is 2m (m is an odd number). Taking 14 strings as an example, every two strings of batteries are connected in parallel to form a battery unit, and then the battery units are connected in series. Wherein: 1 bypass diode 6 is connected in parallel between the 1 st battery unit and the 2 nd battery unit, and so on, a bypass diode 6 is connected in parallel between the 3 rd battery unit and the 4 th battery unit and between the 5 th battery unit and the 6 th battery unit respectively, and the last battery unit, namely the 7 th battery unit is connected in parallel with 1 bypass diode alone. Similarly, 7 is the module positive output and 8 is the module negative output. Correspondingly, the assembly is provided with four junction boxes which are respectively marked as 9,10,11 and 12, wherein the junction boxes 9 and 12 are respectively the positive and negative outputs of the assembly and respectively comprise a bypass diode, and the junction boxes 10 and 11 respectively comprise 1 bypass diode. As shown in fig. 3a, when the first three bypass diodes (the first bypass diode on the left-most side in the figure) are activated, the component power drops only 2/7; the component power only drops 1/7 when the last bypass diode (i.e., the rightmost one in the figure) is activated.
Example 4:
as shown in fig. 4a and 4b, the present embodiment is another scheme in which the number of parallel battery strings is 2m (m is an odd number). Taking 14 strings as an example, the difference between the present embodiment and embodiment 3 is: each cell is connected in parallel with a bypass diode 6, for a total of 7 bypass diodes. As shown in fig. 4a, adjacent bypass diodes may be packaged in a junction box, and bypass diodes adjacent to the positive and negative output terminals may be packaged in a junction box with the positive and negative output terminals. Thus, as shown in fig. 4b, the present embodiment provides 4 junction boxes, which are respectively labeled as 9,10,11, and 12, where the junction box 9 includes a component positive output and 2 bypass diodes; the junction boxes 10 and 11 respectively comprise 2 bypass diodes; terminal block 12 includes the negative output of the module, and 1 bypass diode. When one of the 1 bypass diodes is enabled, the component power drops only 1/7.
Above scheme all is horizontal version type, and along with the silicon chip size is bigger and bigger, the subassembly width receives under the transportation restriction can not too wide condition, and the design through this version will cut back battery piece minor face as the width direction of subassembly, can be as many as possible cluster battery piece and can not influence the width of subassembly, and the scheme through parallelly connected establishing ties again cooperates bypass diode's use can reduce the hot spot risk simultaneously.
It should be noted that the specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims. According to the design scheme of the small battery and the parallel battery string provided by the invention, the number of the battery pieces can be set according to the requirement, and the optimal technical effect is achieved.

Claims (7)

1. The utility model provides a solar PV modules's circuit arrangement mode which characterized in that: the solar cell comprises a plurality of solar cells, wherein the solar cells are connected in series to form a cell string, and the cell string is arranged according to any one of the following modes:
mode 1: 2 battery strings are connected in parallel to form 1 battery string series, 1 or more battery string series are connected in series to form a battery unit, and a plurality of battery units are connected in series to form a photovoltaic module;
mode 2: 4-6 battery strings are connected in series to form a battery string series, 1 battery unit is formed by connecting the battery string series in parallel, and a plurality of battery units are connected in series to form a photovoltaic module;
the number of the battery pieces in the battery string is more than or equal to 2, the areas of the battery pieces are equal, and the battery pieces are connected through welding strips or conductive adhesive; and a bypass diode is connected between two adjacent battery units or in parallel in each battery unit.
2. The circuit arrangement of a solar photovoltaic module according to claim 1, characterized in that: the number of battery cluster is 2m (m is the even number), and every cluster battery piece quantity is more than or equal to 2, forms a battery unit after every two battery clusters connect in parallel, and m battery unit establishes ties again, connects a bypass diode in parallel between every two battery units, if m equals 6, the subassembly is provided with 3 terminal boxes.
3. The circuit arrangement of a solar photovoltaic module according to claim 1, characterized in that: the battery string is 2m (m is an even number) strings, the number of each string of battery pieces is more than or equal to 2, each two strings of battery strings are connected in parallel to form a battery unit, the m battery units are connected in series, each battery unit is connected in parallel with a bypass diode, the m bypass diodes are in total, and if m is 6, the assembly is provided with 4 junction boxes.
4. The circuit arrangement of a solar photovoltaic module according to claim 1, characterized in that: the battery cluster is 4m cluster, and the battery piece quantity in every cluster battery cluster equals, and the terminal box sets up in the subassembly middle part, and wherein every 4 cluster battery cluster are established ties the back, and upper and lower two sets of parallelly connected back of forming a battery unit again, and 1 bypass diode is parallelly connected to every battery unit, forms series connection each other through the middle part busbar between every battery unit, if m is 6, the subassembly sets up 3 terminal boxes.
5. The circuit arrangement of a solar photovoltaic module according to claim 1, characterized in that: the battery string is 2m (m is an odd number) string, the number of battery pieces in each string is more than or equal to 2, each two battery strings are connected in parallel to form a battery unit, the m battery units are connected in series, a bypass diode is connected between every two battery units in parallel, one battery unit is provided with (m-1)/2 bypass diodes in parallel, the rest battery units are separately connected in parallel with one bypass diode and one battery unit is provided with (m-1)/2+1 bypass diodes in parallel, and if m is 7, the assembly is provided with 4 junction boxes.
6. The circuit arrangement of a solar photovoltaic module according to claim 1, characterized in that: the battery string is 2m (m is an odd number) strings, the number of each string of battery pieces is more than or equal to 2, each two strings of battery strings are connected in parallel to form a battery unit, the m battery units are connected in series, each battery unit is connected in parallel with a bypass diode, the m bypass diodes are all connected in parallel, and if m is 7, the assembly is provided with 4 junction boxes.
7. The circuit arrangement of a solar photovoltaic module according to claim 1, characterized in that: the battery strings are 4m (m is an odd number) strings, the number of each string of battery pieces is an even number, the junction box is arranged in the middle of the assembly, after every two strings are connected in parallel to form a parallel unit, two parallel units are connected in series to form a series string, every two series strings are connected in parallel to form a large parallel unit, so that (m-1)/2 large parallel units and 1 small parallel unit are formed, and if m is 7, the assembly is provided with 4 junction boxes.
CN202010598216.8A 2020-06-28 2020-06-28 Circuit arrangement mode of solar photovoltaic module Pending CN111755550A (en)

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CN202010598216.8A CN111755550A (en) 2020-06-28 2020-06-28 Circuit arrangement mode of solar photovoltaic module

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Application Number Priority Date Filing Date Title
CN202010598216.8A CN111755550A (en) 2020-06-28 2020-06-28 Circuit arrangement mode of solar photovoltaic module

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CN111755550A true CN111755550A (en) 2020-10-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115101630A (en) * 2022-08-04 2022-09-23 保定嘉盛光电科技股份有限公司 Photovoltaic assembly for curtain wall

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115101630A (en) * 2022-08-04 2022-09-23 保定嘉盛光电科技股份有限公司 Photovoltaic assembly for curtain wall

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